Search results for "pig"

First evidence of Pleistocene ochre production from bacteriogenic iron oxides. A case study of the Upper Palaeolithic site at the San Teodoro Cave (S…

2020

Abstract The use of iron pigments is well documented in the archaeological horizons of the different parts of the world since the Middle Pleistocene. The mineralogical and chemical composition of the pigments allowed defining, in most cases, their inorganic origin, which were then used after a limited transformation and manipulation. The use of a biogenic ochraceous pigment and its manipulation has recently been described in a late Holocene archaeological horizon of the American continent. Here we describe the earliest case of archaeological use of ferrous pigment produced by iron-oxidising bacteria (FeOB), the first identified in a European Epigravettian (late Upper Palaeolithic) layer, at…

From sepulchre to butchery-cooking: Facies analysis, taphonomy and stratigraphy of the Upper Palaeolithic post burial layer from the San Teodoro Cave…

2020

Abstract The San Teodoro Cave is considered the most significant witness of the first, Epigravettian, human colonization of Sicily from the Italian continent. Furthermore the site is a paradigmatic horizon in the Pleistocene faunal record, demonstrating a progressive transition from mega faunas to smaller-sized, Boreal, faunas. The site has been repeatedly studied and excavated, with different aims and approaches, leading to an interpretation of Epigravettian burial site and daily attendance. Here we propose a reappraisal of the study of the stratigraphy of the site, and in particular of the bone-rich layer (PAL) accumulated over the red ochre layer that apparently sealed all the different …

Characterization of Color Production in Xalla´s Palace Complex, Teotihuacan

2020

A multi-analytical approach was used to characterize color remains from Xalla, a Teotihuacan palace complex (project Teotihuacan, Elite and Government. Excavations in Xalla led by Linda R. Manzanilla). Color samples were obtained from polished lithic instruments and pigment ores. Those samples were analyzed combining microscopic and spectroscopic techniques. Our results coincide with previous studies in Teotihuacan, with the chromatic palette displaying a predominance of iron oxides such as hematite, yellow ochre and natural earths, as well as malachite, celadonite and glauconite. We have enlarged the corpus of raw materials with the characterization of jarosite and bone white and mica as a…

A smartphone-based innovative approach to discriminate red pigments in roman frescoes mock-ups

2022

The characterization of red pigments in frescoes wall paintings has been of great interest for researchers to better understand raw material procurement dynamics, pigment receipts, stylistic evolution and to assess their conservation state. In this study a non-destructive colorimetric approach implementing a smartphone-based method was developed in order to be able to distinguish between three pigments made from minium, haematite and cinnabar minerals, and also mixed pigments, preparing frescoes mock-ups following the roman receipt described by Vitruvius. Portable FT-IR, Raman spectroscopy, portable XRF and visible reflectance spectra analyses were carried out as reference methods for smart…

« Inventaire du lapidaire entreposé dans l’église », Carole PUIG, Nicolas GUINAUDEAU (dir.), Étude historique et archéologique de l’église Saint-Jean…

2020

« Étude du lapidaire », Nicolas GUINAUDEAU (dir.), Cour arrière du Campo Santo. Rue du Bastion Saint-Dominique. Perpignan (Pyrénées-Orientales). 2 : …

2020

Mineralogy of volcanic rocks in Gusev Crater, Mars: Reconciling Mössbauer, Alpha Particle X-ray Spectrometer, and Miniature Thermal Emission Spectrom…

2008

Complete sets of mineral abundances for relatively unaltered volcanic or volcaniclastic rocks in Gusev Crater have been determined by modeling Mössbauer subspectral areas as mineral weight percentages, and combining those percentages with the proportions of iron-free minerals not detected by Mössbauer (normative plagioclase, apatite, and chromite, as calculated from Alpha Particle X-Ray Spectrometer (APXS) chemical analyses). Comparisons of synthetic thermal emission spectra calculated for these mineral modes with measured Miniature Thermal Emission Spectrometer (Mini-TES) spectra for the same rock classes show either good agreements or discrepancies that we attribute to sodic pla…

Über die pharmakologische Prüfung von 2-Skatyl-alkylpyridinen

1968

2-Skatyl-alkylpyridine wurden an verschiedenen isolierten Organen untersucht. Die Substanzen zeigten am isolierten Rattendarm eine kompetitiv-nichtkompetitive anticholinerge Wirkung, am isolierten Meerschweinchendarm eine kompetitiv-nichtkompetitive Antihistaminwirkung. An isolierten Meerschweinchenvorhofen trat nach Gabe der tertiaren 2-Skatyl-alkylpyridine eine durch Atropin aufzuhebende negativ inotrope Wirkung auf, die quartaren Substanzen waren dagegen positiv inotrop wirksam. Die tertiaren Stoffe wirkten blutdrucksenkend, die quartaren bei kleinen Dosen blutdrucksteigernd, bei hoheren Dosen blutdrucksenkend. 2-Skatyl-alkyl-pyridines have been studied on different isolated organs. The …

Involvement of purinergic nerves in the NANC inhibitory junction potentials in pigeon oesophageal smooth muscle.

2004

1. Electrical field stimulation (EFS) (0.5 ms in train of 2-32 Hz for 300 ms) in smooth muscle of pigeon oesophagus, in the presence of atropine (1 microm) and guanethidine (1 microm), elicited an inhibitory response consisting of a transient hyperpolarization (inhibitory junction potential, IJP) associated with muscle relaxation. 2. Sodium nitroprusside (SNP, 100 microm) induced hyperpolarization correlated to mechanical relaxation. 3. The nitric oxide (NO) synthase inhibitor N(omega)-nitro-l-arginine (from 0.1 to 100 microm) caused a concentration-dependent reduction of electromechanical response to EFS indicating a role for NO in this response. 4. Apamin (1 microm) reduced both IJP and r…

PACAP induces bradycardia in guinea-pig heart by stimulation of atrial cholinergic neurones

1996

Based on previous studies which indicated that pituitary adenylate cyclase activating peptide (PACAP) acts as a positive inotropic and chronotropic substance in different species via the cAMP signal transduction pathway, the objective of the present work was to investigate cAMP-regulated myocardial key proteins in response to PACAP in isolated ventricular cells of the guinea pig. Surprisingly, the two molecular forms of PACAP, PACAP(1-27) and PACAP(1-38), showed no effect on intracellular cAMP-levels, L-type Ca2+ channel current or phosphorylation of troponin inhibitor (TnI) and phospholamban (PLB). Additionally, inotropy of isolated guinea-pig ventricular strips was not affected by the neu…